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45 + 27 : 9 = 48; (100 – 19) : 9 = 9; 9 • (36 – 27) = 81; 6 • (72 – 64) = 48; 16 + 9 • 8 = 88; 95 – 9 • 2 = 77; 9 • 6 + 72 : 9 = 62; 8 • 7 – 63 : 9 = 49.
45 + 27 : 9 = 48; (100 – 19) : 9 = 9; 9 • (36 – 27) = 81; 6 • (72 – 64) = 48; 16 + 9 • 8 = 88; 95 – 9 • 2 = 77; 9 • 6 + 72 : 9 = 62; 8 • 7 – 63 : 9 = 49.